bgp: T4490: Add informational message for peer withour AFI
bgp: T4490: Add informational message for peer withour AFI

As we don't use addresss-family ipv4-unicast by default we
should to send informational message about AFI for peer is required

vyos/vyos-1x,vyos/vyos-1x,vyos/vyos-1x,vyos/vyos-1x